Lubricator for loose pulleys.



PATENTED NOV. 14, 1905.

L. O. HOBART.

LUBRIOATOR FOR LOOSE PULLEYS.

I APPLICATION FILED AUG. 14, 1905.

UNTTED STATES PATENT OFFTOF.

LUBRIOATOR FOR LOOSE PULLEYS.

Specification of Letters Patent.

Patented Nov. 14, 1905.

Application iiled August 14, 1905. Serial Nol 274,171.

To @Zt whom, it nw/y concern:

Be it known that I, Louis C. HOBART, a citi- Zen of the United States,residing at Southington, in the county of Hartford and State ofConnecticut, have invented anew and useful Improvement in Lubricatorsfor Loose Pulleys; and I do hereby declare the following, when taken inconnection with the accompanying drawings and the figures of referencemarked thereon, to be a full, clear, and exact description of the same,and which said drawings constitute part of this specication, and

' rep resent, in"

Figure 1, a side view of a pulley constructed in accordance with myinvention; Fig. 2, a vertical sectional view of the same; Fig. 3, a viewof a modified form of oil-conductor; Fig. 4, a sectional View throughthe shaft at a point over` which the pulley is to be placed andrepresenting the longitudinal grooves therein.

This invention relates to an improvement in lubricators for loosepulleys, particularly to such as comprise an oil-chamber within thepulley with passages therefrom to the bearing, the object of theinvention being a simple arrangement of parts whereby the pulley may bereadily constructed and applied to the shaft and which will facilitate afree circulation of lubricating material from the chamber to the surfaceof the shaft; and the invention consists in the construction ashereinafter described,and particularly recited in the claims.

The pulley is formed in two parts 2 and 3, secured together throughtheir webs 4 by bolts 5. As herein shown, the parts 2 and 3 form thepulley proper, but in pulleys of larger diameter these parts form thehub of the pulley, one of the parts supporting a rim of larger diameter.By the term pulley as hereinafter used I therefore wish to be understoodas including either a complete pulley or the hub of a pulley or wheelfor any desired purpose. The adjacent faces of the parts 2 and 3 arerecessed to form a chamber`6, substantially triangular in cross-section,from which ports 7 and 8 extend to a central bore 9. The walls of thebase of the chamber do not meet, but provide space for a collar 10,which is fixed to a shaft 11 by a set-screw 12. The opening in the bore9 is larger than the diameter of the shaft 11 to receive bushings 13 and14, which extend from the outer edges of the port inward to the collar10. Preferably, and as herein shown, the shaft 11 is formed withlongitudinal grooves 15 and 16 on opposite sides, the collar 10 with aninternal groove 17, the bushing 13 with an annular channel 18 openinginto an external channel 19, which extends into communication with thepassage 8 in the chamber 6, while the bushing 14 has an annular groove20, intersecting an externally-arranged channel 21, which extends inwardinto communication with the passage 7. Extending radially through thecollar 10 is a hole 22, into which is inserted a tube 23, the outer endof which is bowed. As shown in Fig. 2 of the drawings, rthe forward faceof this tube is removed, forming an open trough, whereas in Fig. 3 it isshown as closed except at its outer end. Within the chamber 6, onopposite sides, are wings 24 and 25.

In assembling the pulley one of the parts, as 2, is iirst placed overthe shaft. Then the collar 10 is placed on the shaft and moved to thedesired position and there fixed by the set-screw 12. The other part 3of the pulley is then placed in position and secured by the bolts 5 andthe bearings packed bythe bushings 13 and 14. As the pulley revolves oilcarried in the chamber will enter the tube 23 and pass through thecollar into the groove 17 therein, from which it flows through thechannels 15 and 16, lubricating the surface of the shaft on which thebushings turn. As the oil reaches the end of the channels it enters thegroove 18 or 2() and passes through the channels 19 or 21 and againenters the chamber through the holes 7 or 8. For very fast revolvingpulleys the wings 24 and 25 will not be required; but if the pulleysturn very slowly the momentum would not necessarily carry the oil over,and so the wings are desirable for the purpose of giving the oil animpetus to turn it with the pulley, so thatas the pulley revolves aportion of the oil at cach revolution will enter the tube 23. It willthus be seen that a complete circulation of lubricating' material ismaintained between the chamber and the bearing, and the constructionpermits of the ready removal and replaceal of bushings as required andprovides a system of lubrication which is freefrom excessive orincreased friction caused by the enlarged diameter of the frictionalsurfaces. In addition to performing the function of preventing anyrelative movement between the shaft and the tube, the collar, beingsecured to the shaft by the set-screw and bearing against the interiorfaces of the hub, prevents any movement of the pulley along the axis ofthe shaft, thus IOO doing away with the necessity of using a ring orcollar external to the pulley, thus making the mechanism more compact.

Having fully described my invention. what I claim as new, and desire tosecure by Letters Patent, is-

l. The combination with a shaft, of a pulley formed in two partsrecessed at their inner faces to form a chamber, and to provide a spacefor a ring, a ring located between said parts and secured to said shaft,bushings surrounding the shaft and closely fitting the interior of thepulley on opposite sides of the ring, there being a passage from saidchamber through said ring to the surface of the shaft, grooves andchannels in the bushings, and passages from the chamber to saidchannels, substantially as described.

2. The combination with a shaft having longitudinal grooves, of a pulleyformed in two parts, recessed at their inner faces to form a chamber toprovide a space for a ring, a ring located 'between said parts andsecured to said shaft, bushings 'surrounding the shaft and closelyfitting' the interior of vthe pulley on opposite sides of the ring,there being a passage from said chamber through'said ring to the surfaceof the shaft, grooves and channels in the bushings, and passages fromthe chamber to said channels, substantially as described.

3. The combination with a shaft, of a pulley formed in two partsrecessed at their inner faces to form a chamber, and to provide a spacefor a ring, a ring located between said parts and secured to said shaft,there being wings in said chamber, bushings surrounding the shaft andclosely fitting the interior of the pulley on opposite sides of thering, there being a passage from said chamber through said ring to thesurface of the shaft, grooves and channels in the bushings, and passagesfrom the chamber to'said channels, substantially as described.

4. The combination with a shaft, of a pulley formed in two partsrecessed at their inner faces to form a chamber and to provide space fora ring, a ring located between said parts and securedsto said shaft, acurved tube inserted into and secured to said ring, bushings surroundingthe shaft and closely fitting the interior of the pulley on oppositesides of the ring, there being a passage from said chamber through saidring to the surface of the shaft, grooves and channels in the bushings',and passages from the chamber to said channels, substantially asdescribed.

ln" testimony whereof I have signed this specification in the presenceof two subscribing witnesses.

LOUIS (lHOBART.

Witnesses:

FRED. C. EARLE, GRACE C. DoLBnc.

